摘要
通过建立地下水平埋管换热器模型,模拟了土壤导热系数对埋管及其周围土壤温度场分布和埋管换热量的影响。分析了埋管管材及埋管埋深、管径、管壁厚度等对埋管换热的影响。模拟结果显示,当土壤导热系数从1.1W/(m·℃)增大到2.5W/(m·℃)时,埋管单位管长换热量增幅达100.8%,且到埋管距离越近的点,其土壤温度随土壤导热系数的变化相对较快。地下二层埋管外表面温度及其周围土壤温度变化比地下一层换热稳定性好,换热量大。适当的加大管径,减小管壁厚,有利于增强埋管换热。
With the change of soil conductivity, the temperature field and the heat flow distributions for horizontal buried pipes of the heat exchanger for the GSHP were calculated and analyzed according to a new two-dimension model for the horizontal buried pipes. Then the conditions which related to heat transfer of the heat exchanger were presented, such as hurled depths, pipe＇s diameter, pipe wall＇s thickness and pipe＇s material. The results show that when the soil conductivity increases form 1.1 W/（（m·℃） to 2.5 W/（m·℃）, the heat transfer of one meter length of pipe increases by 100. 8%, and the temperature of the soil which is closer to the pipe changes more faster with soil conductivity. The heat transfers of the buried pipes are larger and more stable in the second stage than in the first layer underground. Bigger diameter and thinner wall thickness of pipes are helpful to increase the heat transfer of the buried pipe of the heat exchanger.
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2009年第4期475-480,共6页
Acta Energiae Solaris Sinica
基金
国家自然科学基金(50278021)
关键词
土壤源热泵
水平埋管
土壤导热系数
土壤温度场
ground-source heat pump
horizontal buried pipe
soil conductivity
soil temperature field
